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Plant Physiology 50:616-621 (1972)
© 1972 American Society of Plant Biologists

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Articles

N6-({Delta}2-Isopentenyl)adenosine: Its Occurrence as a Free Nucleoside in an Autonomous Strain of Tobacco Tissue 1,2

W. H. Dyson and R. H. Hall

a Department of Biochemistry, McMaster University, Hamilton, Ontario, Canada

Cytokinins from both the free nucleoside pool and the transfer RNA have been isolated and identified in a habituated strain of tobacco pith callus (Nicotiana tabacum [L] var. Wisconsin 38). The transfer RNA of this strain contains both N6-({Delta}2-isopentenyl) adenosine and N6-(4-hydroxy-3-methylbut-2-cis-enyl) adenosine. The trans-hydroxylated derivative is absent from the transfer RNA of this dark-grown tissue. N6-({Delta}2-Isopentenyl)-adenosine was identified as a component of the free nucleoside pool in concentrations of about 10 micrograms per kilogram of tissue.

The cytokinin-requiring tissue grown in the presence of N6-furfurylaminopurine contains less than 85 nanograms per kilogram of N6-({Delta}2-isopentenyl) adenosine. This is the detectable limit under the conditions of the experiment.

1 This work was supported by a grant from the Canadian Cancer Society.

2 A preliminary report of this work was presented at the 1971 American Society of Plant Physiologists meeting, Asilomar, Calif.






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